For me there is nothing like Luis Miguel and Jose Feliciano for the Bolero Music. Luis Miguel "Lo Mejor de Mi" and Jose Feliciano's "Senor Bolero" or "Si Me Comprendieras (Bolero). Try to look in YouTube. It should be there.
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Ibrahim Ferrer (he's the great singer on the Buena Vista Social Club recordings) made a recording of Boleros called "Mi Sueo". I think "Bolero"refers to the musical form. Some of the songs don't have the right tempo to DANCE Bolero, but some of them do. "Dos Almas" is one of the good ones. His "Perfidia" meets your requirement of hot/sultry, but I think it's a little fast for dancing Bolero. But you may like the tempo. And I'm pretty sure you'll like all the music on this CD.
2) Natalie Cole (Acercate mas, Cuando vuelva a tu lado (good, good), Cachito (Nat "King" Cole))
Less know, but excellent:
3) Los Tri-O
(Adoro, Mia, Romance, No, etc)
4) Felipe Pirella (Sombras nada mas,Unicamente tu, La ultima copa)
5) Others: (Perfidia from Baila tu ritmo latino), ideal for dance (Tamara: si nos dejan) (Ana Belen: No se por que te quiero) (Juan Gabriel y Rocio Durcal: Tu me dijiste adios) (Alejandro Fernandez: Cuando ya no me quieras, Perfume de gardenias)
Apart from being a teacher, I also DJ for Salsa, and all latin rhythms.. will digout some titles ( have over 200. ) may take a little time. NO pop style ...all indigenous..Do you prefer male or female vocals ?